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the belt will be tight but the front wheel needs realigning with the drive pulley
there is a small lever of adjuster screw on the side that by moving it when the belt running you can get the belt back to run in the correct position

On what vehicle? Most cars have electronic controlled timing. You cannot adjust the timing. You can however realign the camshaft timing however this will require access to the timing belt and knowledge of how to align the timing marks as well as how to move the belt. If it has indeed jumped timing then the belt probably does need replacing.

the adjustment is to realign the roller that the belt runs on as it is now not parallel to the other roller
so the allen key or spanner will fit in one end of the roller shaft and move it forward or back
go google and type in-- operators manual for ( make and model of machine) and find the pdf version download.

the belt may need adjusted also if the belt is off canter it will rub causing an annoying sound due to it rubbing some parts inside the base. try adjusting the belt if you feel you can if not there are places that will do it for you. I hope all is well.

Check the rear endcaps for damage. If they are OK, find the allen key that came with the treadmill (you used it to assemble the machine) and go to the back of the machine. If the belt is rubbing, find the left adjustment bolt and turn the screw 1/2 turn clockwise. Now, by hand move the belt a couple revolutions. If it still rubs, repeat the procedure till the belt stops rubbing. Now run the treadmill about 3MPH and fine adjust the belt by turning the screw 1/4 turn until straight.If the belt is not rubbing, run the machine (3MPH) and adjust the left bolt clockwise 1/8 - 1/4 turn watching closely till the belt is centered.

When you purchased the treadmill it came with an allen wrench to assemble the machine. That is the adjustment tool. Inspect the rear plastic cap (the adjustment bolts are there) make sure it is not damaged. If the plastic is broken, it will need to be replaced. This job is not easy. If it is not broken, adjust the belt as follows..If the belt is already rubbing, locate the adjustment screw at the back of the treadmill on the side that is rubbing.Adjust that screw tuning it 1/2 turn clockwise. Move the belt manually 3 full rotations.. If it is still rubbing, turn another 1/4 turn. Again move the belt manually 3 rotations. Once the rubbing stops, run the machine slowly and watch the belt from the back of the machine..

Find the allen key that came with the treadmill. It is used to assemble and adjust the treadmill.Locate the 2 adjustment screws at the rear of the machine. If the belt is shifting to the left, tighten the left screw (turn clockwise) and the same if the belt goes to the right, tighten the right.Only turn the screw 1/2 turn and move the belt manually to shift the belt. If it requires more, turn another 1/4 turn, very little adjustment may be required to straighten the belt. Once the belt stops rubbing, start the machine running slowly (1-2 mph) and observe the belt FROM DIRECTLY BEHIND THE MACHINE. Carefully adjust the rear roller till the belt is as close to center as possible making small adjustments, 1/8-1/4 turn clockwise of the adjustment screws.

there should be adjustment screws on the rear roller.only adjust one of them (usually the left) if the belt rubs on the left turn the screw clockwise 1/4 turn and if the belt rubs on the right turn counterclockwise. Make small adjustments until the belt stays in the center

You may have a frozen bearing on the tensioner or belt idler. This will cause the belt to burn and smell. I think you are on the right track. I would remove the belt and spin the idler and adjuster by hand to see that they are free and don't have excessive play in them. Replace as necessary.